You may be very familiar with some of your own signs of sleep deprivation. Besides the really obvious stuff--feeling tired or drowsy--you may also show the following signs (Dement and Vaughan 1999):
In addition, you may become more emotional in response to disturbing images or events (Yoo et al 2007).
But what about your children? Like you, they show behavioral changes when they are sleep-deprived. But the signs of sleep deprivation can be harder to recognize. Babies can’t articulate their feelings, and, as I note below, some signs in older children may look deceptively like symptoms of hyperactivity attention deficit disorder.
Here I provide a guide to identifying signs of sleep deprivation for the whole family. Because adult signs are often the easiest to recognize, I start with an overview of adult signs of sleep deprivation. Then I cover babies and older kids.
According to world-renowned sleep researcher William Dement, the best
way to understand your sleep needs is to keep a sleep diary. To do
that, you rate yourself using the Stanford Sleepiness Scale (quoted here
from Dement and Vaughan 1999):
Dement recommends that you rate yourself every two hours during your waking day for several days in a row. This will help you track your circadian rhythms--when during the day you are at peak alertness, and when you feel less wakeful.
According to Dement’s research (which has focused on American subjects), well-slept adults should feel alert after waking in the morning. They shouldn’t need special aids (like persistent wake-up alarms, cold showers, caffeine etc.) to get going.
How alert should you be? You can test your alertness level—and other
signs of sleep deprivation--with this amusing (and valid) experiment online.
After awakening, alertness should gradually decline for the next 6 hours or so, and then increase again until it reaches a second peak in the evening (about 15 hours after awakening). After this peak is reached, healthy adults should experience a sharp decline in alertness as they become progressively more drowsy (Dement and Vaughan 1999)
If your own pattern deviates from this norm, you might be sleep deprived. In particular, feeling sleepy during the morning hours--and feeling as if you could easily drowse off during times that are typically associated with alertness--are classic signs of sleep deprivation.
Another sign of trouble is feeling too restless or “wired” to sleep at bedtime. There is evidence sleep deprivation causes elevated levels of cortisol (the stress hormone) in the afternoon and evening (Copinschi 2005). In addition, people suffering from insomnia have abnormally high levels of cortisol at night (Rodenbeck and Hajak 2001).
Signs of sleep deprivation in babies
Babies may be pretty good at regulating their own sleep if they are given plenty of opportunities for quiet time. But it’s possible for things to go wrong. Read more about it in my article about signs of sleep deprivation in babies.
Signs of sleep deprivation in children
Kids are notoriously bad judges of their own sleepiness. In experiments where 8-10 year olds were not permitted to sleep more than 4 hours at night, kids performed worse on cognitive tests. But (no surprises here!) these same kids insisted that they were not sleepy (Dement and Vaughan 1999).
Signs of sleep deprivation in kids include many of the same signs we see in adults. For instance, kids may
Interestingly, lack of concentration and inadvertent napping are also considered symptoms of attention deficit hyperactivity disorder (ADHD).
Other signs of sleep deprivation are also consistent with ADHD, including
There is a growing body of research to suggest that some kids who have been diagnosed with ADHD are really just sleep-deprived (Shur-Fen Gau 2006). But sleep restriction doesn’t always lead to ADHD symptoms (Fallone et al 2001), and it’s possible that ADHD causes sleep disturbances.
Children may also become more moody when sleep-deprived. A recent study of healthy American elementary school students links more intense emotionality with sleep problems (El Sheikh and Buckhalt 2005).
Researchers monitored kids’ sleep with wrist actigraphs (which can detect the physiological signs of sleep) and parental reports. They found that the most emotional kids got the least amount of sleep and had the highest number of night wakings (El Sheikh and Buckhalt 2005).
Results like these seem to confirm our everyday experience. But, as noted above, it’s not yet clear if sleep problems are the cause or the effect of intense emotionality. Both may be true, which case emotional kids may be prone to fall into a vicious circle--emotional intensity making it hard to sleep, and sleeplessness promoting greater emotional intensity.
Chronic sleep loss: When sleeplessness continues over the long-term
As these signs of sleep deprivation illustrate, poor sleep makes life unpleasant. More worrying, however, are long-term problems for behavior, health, and cognition.
As noted above, kids who get less sleep are more likely to show symptoms associated with ADHD. In addition, they are more likely to be diagnosed with behavioral problems in general (Lavigne et al 1999).
Sleep restriction is associated with impaired memory (Hairston et al 2005), poor academic performance (Fallone et al 2005), and obesity (Lumeng et al 2007; Bell and Zimmerman 2010).
Perhaps most alarming is the idea that sleep deprivation in early childhood could impair cognitive performance later on.
A recent prospective study tracked Canadian children from age 2.5 to 6 years (Touchette et al 2007). Researchers found that kids who got less sleep overall—especially before 41 months—had higher rates of hyperactivity and impulsivity at 6 years of age.
They also performed lower on neurodevelopmental tests. Kids who were poor sleepers at the beginning of the study performed worse at age 6, even if their sleep times improved after age 3. This led the researchers to speculate that there is a “critical period” in early childhood, when the effects of sleep restriction are especially harmful (Touchette et al 2007).
Sleepless kids may not always show clear signs of sleep deprivation
In many cases, it’s pretty easy to identify kids with sleep problems. But parents may have trouble recognizing the signs of sleep deprivation in their kids. And it appears that many kids go undiagnosed.
An experimental study of school-aged kids has shown that even kids who had no reported sleep difficulties performed better on neurobehavioral tests after they were given an extra hour of sleep (Sadeh et al 2003).
For this reason, it makes sense to examine your child’s sleep schedule--even if he doesn’t show obvious signs of sleep deprivation. Good sleep practices will help ensure that your child gets the sleep he needs. These practices include
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